THE ASTRONOMER Electronic Circular No 803 1993 Dec 29 19.29UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074 TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885 GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH ------------------------------------------------------------------- NOVA CASSIOPEIAE 1993 The Editor reports his analysis of 470 observations received both direct and via various overseas groups. A major contribution has come from observers in Japan within the Variable Star Observers League (VSOLJ) and we are grateful for the daily e-mailed reports collated by Yasuto Takenaka. In view of the apparent substantial fluctuations in this nova over short time scales, means have been calculated on a 0.5-day basis. Min and Max provide an indication of the scatter in results some of which may be genuine fluctuation although there will be probable observational error in other cases. Nova Cas 1993 0.5d Means JD 2449000+ JDmean Mag No Obs Max Min Scatter STD 333.0 6.40 1 6.40 6.40 0.00 0.000 333.5 6.30 1 6.30 6.30 0.00 0.000 334.0 6.54 26 6.39 6.80 0.41 0.105 334.5 6.36 10 6.20 6.50 0.30 0.102 335.0 6.30 18 6.00 6.60 0.60 0.194 335.5 6.20 20 5.80 6.60 0.80 0.222 336.0 6.42 17 6.10 6.60 0.50 0.169 336.5 6.25 4 5.80 6.50 0.70 0.269 337.0 6.39 44 5.90 6.90 1.00 0.189 337.5 6.47 15 5.90 6.70 0.80 0.202 338.0 6.43 3 6.10 6.60 0.50 0.236 338.5 5.99 16 5.40 6.50 1.10 0.318 339.0 5.75 50 5.40 6.10 0.70 0.195 339.5 5.57 21 5.20 6.00 0.80 0.213 340.0 5.77 37 5.40 6.20 0.80 0.215 340.5 6.24 8 5.80 6.70 0.90 0.316 341.0 6.76 25 6.30 7.30 1.00 0.208 341.5 6.41 7 6.20 6.60 0.40 0.155 342.0 6.76 10 6.50 6.90 0.40 0.102 342.5 6.87 11 6.50 7.10 0.60 0.178 343.0 6.49 17 6.20 6.90 0.70 0.198 343.5 6.61 16 6.30 7.00 0.70 0.208 344.0 6.23 8 6.10 6.30 0.20 0.066 344.5 6.54 8 6.10 7.10 1.00 0.264 345.0 6.67 18 6.30 6.90 0.60 0.176 345.5 6.62 5 6.50 6.70 0.20 0.075 346.0 6.88 17 6.50 7.40 0.90 0.250 346.5 6.40 1 6.40 6.40 0.00 0.000 347.0 6.44 36 6.20 6.50 0.30 0.076 No observations in analysis 470